Merge pull request #1797 from AlgorithmWithGod/Ukj0ng

[20260116] BOJ / G5 / 무한 수열 / 한종욱

Author: ShinHeeEul

Ukj0ng/202601/16 BOJ G5 무한 수열.md

@@ -0,0 +1,40 @@
+```
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    private static final BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    private static final BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+    private static Map<Long, Long> map;
+    private static int P, Q;
+    private static long N;
+
+    public static void main(String[] args) throws IOException {
+        init();
+
+        long answer = backTracking(N);
+        bw.write(answer + "\n");
+        bw.flush();
+        bw.close();
+        br.close();
+    }
+
+    private static void init() throws IOException {
+        StringTokenizer st = new StringTokenizer(br.readLine());
+        N = Long.parseLong(st.nextToken());
+        P = Integer.parseInt(st.nextToken());
+        Q = Integer.parseInt(st.nextToken());
+
+        map = new HashMap<>();
+    }
+
+    private static long backTracking(long n) {
+        if (n == 0) return 1;
+        if (map.containsKey(n)) return map.get(n);
+
+        long temp = backTracking(n/P) + backTracking(n/Q);
+        map.put(n, temp);
+        return temp;
+    }
+}
+```